What you need to know for the week of Sept. 17-23

SR 99 Alaskan Way Viaduct

• From 9 p.m. Friday, Sept. 21, to the evening of Saturday, Sept. 22, northbound SR 99 between South Spokane Street and the south end of the Battery Street Tunnel will be closed. 
  • The South Royal Brougham Way on-ramp to northbound SR 99 will reopen on the evening of Saturday, Sept. 22.
• From the evening of Saturday, Sept. 22 to 5 a.m. Monday, Sept. 24, northbound SR 99 between South Spokane Street and South Royal Brougham Way will be closed.

I-405/SR 167 Renton

• From 8:30 p.m. Friday, Sept. 21, to 5 a.m. Monday, Sept. 24, all lanes of southbound SR 167 between I-405 and South 180th Street will be closed.
• The following ramps will also close:
  • The northbound I-405 ramp to northbound SR 167.
  • The southbound I-405 ramp to southbound SR 167.
  • The southbound SR 167 ramp to northbound I-405.

I-90 Mercer Island

• From 6 a.m. to 11:59 p.m. on Saturday, Sept. 22, westbound I-90 will be reduced to two lanes between Bellevue Way and the floating bridge.
• The following westbound I-90 on-ramps will also close:
  • Bellevue Way.
  • East Mercer Way.
  • 76th Avenue Southeast.

I-5 Seattle

• All mainline lanes of southbound I-5 near I-90 in downtown Seattle will close nightly during the following dates/times:
  • 11 p.m. Saturday, Sept. 22 to 5 a.m. Sunday, Sept. 23.
    • Two lanes will remain closed from 5 to 8 a.m. Sunday morning.
  • 11 p.m. Sunday, Sept. 23 to 4:30 a.m. Monday, Sept. 24.
• Southbound travelers will be shifted onto the collector/distributor lanes during the closure. 

SR 524 Lynnwood

• From 8 p.m. Friday, Sept. 21, to 6 a.m. Monday, Sept. 24, all lanes in both directions of SR 524 near Locust/Larch Way will be closed.

US 2 Lake Stevens/Everett

• The closure of westbound US 2 scheduled Sept. 21-24 is postponed due to inclement weather in the forecast. The closure is rescheduled for 7 p.m. Friday, Sept. 28 to 4 a.m. Monday, Oct. 1.

I-5 Marysville

• The closure of the northbound I-5 off-ramp to 116th Street Northeast scheduled for Sept. 21-24 is postponed to a later date due to inclement weather in the forecast. 

I-90 Preston

• From 8 p.m. Sunday, Sept. 23, to 5 a.m. Friday, Sept. 28, a single lane of westbound I-90 across the Raging River Bridge will be closed, weather-dependent. 

Traffic events calendar:

• Plan ahead by checking for major traffic impacts on all state highways.